I've got an 09 with custom tunes from ******** and an sct programmer. I just started noticing my rail pressure drops when I get to about 24000. Drops to about 14000ish.. if I let off the throttle and step on it again it will jump to about 29000. No codes. No funny smoke. I just installed a egr ****** with intake and my truck is running better than it has ever. Best fuel milage I've ever gotten.I've got 160000+- and replaced the hpfp and injectors at 110000. Any ideas??